Help with pluggable.php (4 posts)

When I type out a post or page and submit it, I get the following message:

Warning: Cannot modify header information - headers already sent by (output started at /home/facelike/public_html/wp-includes/wp-db.php:133) in /home/facelike/public_html/wp-includes/pluggable.php on line 331

That's all I get. However, if I go to my site, the post/page shows up exactly as I wrote it.

I've searched for this on here and Google and I couldn't find any solution. Do you guys have any suggestions?